Nanometric Nickel Exsolution in the Hexagonal ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Nanometric Nickel Exsolution in the Hexagonal Perovskite Ba8Ta6NiO24: Survey of the Structural, Magnetic and Catalytic features
Auteur(s) :
Pussacq, Tanguy [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mentre, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tessier, Franck [Auteur]
Laboratoire Verres et Céramiques
Löfberg, Axel [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Huvé, Marielle [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Guerrero-Caballero, Jesús [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Colis, Silviu [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Kabbour, Houria [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Mentre, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tessier, Franck [Auteur]
Laboratoire Verres et Céramiques
Löfberg, Axel [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Huvé, Marielle [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Guerrero-Caballero, Jesús [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Colis, Silviu [Auteur]
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
Kabbour, Houria [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Titre de la revue :
Journal of Alloys and Compounds
Numéro :
766
Pagination :
987-993
Date de publication :
2018
Discipline(s) HAL :
Chimie/Catalyse
Chimie/Chimie inorganique
Chimie/Chimie inorganique
Résumé en anglais : [en]
Nickel nanoparticles that decorate the surface of a parent oxide are well known to be developed by some cubic-type perovskites from the exsolution of their intrinsic Ni 2+ species in reducing conditions with subsequent ...
Lire la suite >Nickel nanoparticles that decorate the surface of a parent oxide are well known to be developed by some cubic-type perovskites from the exsolution of their intrinsic Ni 2+ species in reducing conditions with subsequent catalytic properties. In this work, we show similar phenomenon in a hexagonal-type perovskite. The reducing treatment in ammonia of Ba 8 Ta 6 NiO 24 , a hexagonal perovskite-type oxide, leads to the exsolution of Nickel nano-sized particles at the surface of the precursor leaving oxygen vacancies and partially depleted but rearranged Ni/Ta sites. Spectroscopic methods, X-ray diffraction, TEM and TGA were employed to investigate the Ni exsolution while TGA was used to investigate the thermal behavior and its reversibility. 50 % of the initial nickel content transferred into Ni 0 nanoparticles as determined from M(H) magnetization plots and TGA, in agreement with the concomitant creation of oxygen vacancies in the preserved Ni 2+ coordination (50 %). The cationic vacancies (V c) involve face-sharing octahedral dimers in which Ni/Ta/V c rearranged through the shared face window, but preserves a non-centrosymmetric cationic partition. Ni exsoluted oxides often show a catalytic activity; we present here an original example of a hexagonal perovskite with catalytic activity toward syngas production by reforming of methane with carbon dioxide.Lire moins >
Lire la suite >Nickel nanoparticles that decorate the surface of a parent oxide are well known to be developed by some cubic-type perovskites from the exsolution of their intrinsic Ni 2+ species in reducing conditions with subsequent catalytic properties. In this work, we show similar phenomenon in a hexagonal-type perovskite. The reducing treatment in ammonia of Ba 8 Ta 6 NiO 24 , a hexagonal perovskite-type oxide, leads to the exsolution of Nickel nano-sized particles at the surface of the precursor leaving oxygen vacancies and partially depleted but rearranged Ni/Ta sites. Spectroscopic methods, X-ray diffraction, TEM and TGA were employed to investigate the Ni exsolution while TGA was used to investigate the thermal behavior and its reversibility. 50 % of the initial nickel content transferred into Ni 0 nanoparticles as determined from M(H) magnetization plots and TGA, in agreement with the concomitant creation of oxygen vacancies in the preserved Ni 2+ coordination (50 %). The cationic vacancies (V c) involve face-sharing octahedral dimers in which Ni/Ta/V c rearranged through the shared face window, but preserves a non-centrosymmetric cationic partition. Ni exsoluted oxides often show a catalytic activity; we present here an original example of a hexagonal perovskite with catalytic activity toward syngas production by reforming of methane with carbon dioxide.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Collections :
Équipe(s) de recherche :
Matériaux inorganiques, structures, systèmes et propriétés (MISSP)
Valorisation des alcanes et de la biomasse (VAALBIO)
Valorisation des alcanes et de la biomasse (VAALBIO)
Date de dépôt :
2019-09-25T14:38:07Z
2019-10-25T14:26:04Z
2023-02-07T10:36:53Z
2019-10-25T14:26:04Z
2023-02-07T10:36:53Z
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